The division between the states is not a river, but a demarcation line.
The only major river that the states share is the Nanticoke River in southwest Delaware.
Maryland is West of Delaware and South of Delaware.
Delaware Maryland
Delaware. Delaware is a tiny state - it has only three counties. It was a slave state, like Maryland. Delaware borders only Maryland, and Maryland is in between Delaware and the rest of the southern states. Maryland tried to secede, and Lincoln imprisoned its governor and most of its state legislators without trial, and installed a new government in Maryland made up of pro-Union men. Delaware, seeing what happened to Maryland, did not even try to get out of the Union.
Delaware is located on the west bank of the Delaware River, just south of Pennsylvania and west across the Delaware Bay from New Jersey. It is also to the east and north of the state of Maryland. Delaware has beaches on the Atlantic Ocean that are just north of the Maryland beaches.
Maryland.
Delaware
maryland
Delaware is bordered by Maryland, new jersey, and pennsylvania
Delaware shares a border with Pennsylvania and with Maryland.
The Delmarva Peninsula is located on the East Coast of the United States, bordered by the Chesapeake Bay to the west, the Atlantic Ocean to the east, and the Delaware River to the north. It includes parts of Delaware, Maryland, and Virginia.
Maryland
The pan handle of the state of Idaho borders WA state to the east.